P0287 Cylinder 9 Contribution/Balance Fault

P0287 points to a cylinder 9 contribution or balance fault. Cylinder 9 is not contributing as expected compared with the other cylinders.

Code status

Needs verification

Not yet verified against SAE J2012_202509 / J2012DA. Treat unverified rows as a lookup aid, not repair authority.

System: Injector
Scope: iso-sae-controlled-p0
Standard: SAE J2012 / ISO 15031-6
Source: legacy-import

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace injector 9 until contribution data is compared with compression and control checks.

Useful checks before replacing parts

Compare cylinder 9 contribution, misfire counters, injector balance, compression, fuel pressure, and ignition or glow data where applicable.
Inspect injector operation, injector command, wiring, compression, air leaks, exhaust restrictions, and fuel quality.
Check whether the imbalance is idle-only, load-dependent, cold, hot, or paired with cylinder 9 circuit or misfire codes.

Related OBD-II codes

These nearby injector entries can help compare wording and fault area. They may share the same verification status as the source database.